tensorflow/models · error · ValueError

Unknown inner block type.

Error message

Unknown inner block type.

What it means

Error "Unknown inner block type." thrown in tensorflow/models.

Source

Thrown at official/projects/deepmac_maskrcnn/modeling/heads/hourglass_network.py:511

def _encoder_decoder_depth(network):
  """Helper function to compute depth of encoder-decoder blocks."""

  encoder_block2_layers = _layer_depth(network.encoder_block2)
  decoder_block_layers = _layer_depth(network.decoder_block)

  if isinstance(network.inner_block[0], EncoderDecoderBlock):

    assert len(network.inner_block) == 1, 'Inner block is expected as length 1.'
    inner_block_layers = _encoder_decoder_depth(network.inner_block[0])

    return inner_block_layers + encoder_block2_layers + decoder_block_layers

  elif isinstance(network.inner_block[0], ResidualBlock):
    return (encoder_block2_layers + decoder_block_layers +
            _layer_depth(network.inner_block))

  else:
    raise ValueError('Unknown inner block type.')


def hourglass_depth(network):
  """Helper function to verify depth of hourglass backbone."""

  input_conv_layers = 3  # 1 ResidualBlock and 1 ConvBlock

  # Only intermediate_conv2 and intermediate_residual are applied before
  # sending inputs to the later stages.
  intermediate_layers = (
      _layer_depth(network.intermediate_conv2) +
      _layer_depth(network.intermediate_residual)
  )

  # network.output_conv is applied before sending input to the later stages
  output_layers = _layer_depth(network.output_conv)

  encoder_decoder_layers = sum(_encoder_decoder_depth(net) for net in

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/projects/deepmac_maskrcnn/modeling/heads/hourglass_network.py:511 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tensorflow/models@e006f5f0d5 (2026-08-24). Data as JSON: /api/errors/d11abe42dde3272e. Report an issue: GitHub.